Killzone should be moved to the "Doesn't work with Dualshock 1 controllers" list, or perhaps you should make a list of games that only partially work with a DS1 (like SOCOM,) and put Killzone on that list.

Killzone makes use of the DS2's pressure-sensitive D-pad. When sniping, you use "up" and "down" to zoom in and out. The harder you push either button, the faster the scope zooms. In the controller configuration screen, you use sliders to adjust the sensitivity for looking on the x and y axes. These sliders function in a manner similar to the sniping controls. If you play with a DS1 controller, the sliders move really fast, and it's hard to adjust the sensitivity to a good level.

Interesting find. I think when Ive played killzone 1 recently I've used the dualshock 1 even for sniping. Maybe then the dualshock 1 dpad was making the sniping feel even more unwieldy then normal for me. Think your idea of creating a "partially works with ds1" section in the list would make sense. Ill update the list now.

Would it be worth it to include a section for games that are also compatible with the original Playstation controller? (The one without any thumbsticks.) Amplitude is compatible with the DS1, but isn't compatible with the original Playstation controller. Capcom Classics Collection Volume 2 is compatible with all three controllers. Kingdom Hearts is only compatible with the Dualshock 2.

Edit: Also, Mortal Kombat: Deadly Alliance is compatible with all three controllers.